From 2a768264eef098cc1355b02ca5023b6cfb183a1f Mon Sep 17 00:00:00 2001 From: Eddie Huang Date: Wed, 22 Oct 2014 21:12:07 +0800 Subject: [PATCH] tty: serial: Fix mediatek UART driver setting baudrate issue In mtk8250_set_termios function, calculating quot value can not be zero, otherwise, using DIV_ROUND_CLOSEST(port->uartclk, quot * baud) will fail due to divisor is zero. Signed-off-by: Eddie Huang Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_mtk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 8f37d57165ec..6f93123a428a 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -74,14 +74,14 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, /* Set to next lower baudrate supported */ if ((baud == 500000) || (baud == 576000)) baud = 460800; - quot = DIV_ROUND_CLOSEST(port->uartclk, 4 * baud); + quot = DIV_ROUND_UP(port->uartclk, 4 * baud); } else { serial_port_out(port, UART_MTK_HIGHS, 0x3); /* Set to highest baudrate supported */ if (baud >= 1152000) baud = 921600; - quot = DIV_ROUND_CLOSEST(port->uartclk, 256 * baud); + quot = DIV_ROUND_UP(port->uartclk, 256 * baud); } /*